This name is a synonym of Allium acuminatum Hook..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 295391) with original publication details: Fl. Rocky Mts. 160 1917.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:8736-2.
This name was in version 1 of The Plant List, record kew-295391, and has not been changed.